When planes are on a southerly flow into the Seattle airports, the traffic comes over our house all the time. The SeaTac traffic is always a bit higher but the Boeing Field traffic can be lower and visible from the window. If I notice something is coming, I can grab the camera and take some shots of the jets passing overhead. This includes the 777X test aircraft. On a clear day, things are pretty straightforward but a bit of cloud can really make for more interesting shots.